/Engine/Plugins/Developer/PluginUtils/Source/PluginUtils/Public/PluginUtils.h
Dirty assets that need to be saved will be unloaded anyway
Whether plugin assets were successfully unloaded
static bool UnloadPluginsAssets ( const [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > & PluginNames, [FText](API\Runtime\Core\Internationalization\FText) * OutFailReason )